Typewriting machine



J. E. DAVIDSON.

TYPEWRITING MACHINE.

APPLICATION FILED SEPT. 1|. 1918.

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TYPEWRITING MACHINE.

APPLICATION FILED SEPT- 1, 191a.

Patented June13, 1922.

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are same ear ear oasis JOSHUA E: DAVIDSON, OF NEW YORK, N. Y., ASSIGNOR TO UNDERWOOD TQYPE'WRITEB COMPANY, OF NEW YORK, N, Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

To all whom it may concern:

Be it known that I, JOSHUA E. DAvIDsorr, a citizen of the United States, residing in the borough of the Bronx, in the county of the Bronx, city and State of New York, have inventedcertain new and useful Imrovements in Typewritin'g Machines, of which the following is a specification.

This invention relates to typewriting machines in which the work consists of superposed plies of web which are fed around a revoluble platen. These plies with the interleaved carbons sometimes make a thick sheet or pack, and in feeding around the platen there is set up a tendency of the plies to creep upon one another, the outer ply being apt to travel more rapidly than the inner ply, owing to the greater distance of the outer ply from the axis of rotation of the platen. The plies and carbons when feeding around the platen make practically a body which is solid with the platen, thus setting up a difference in rate of travel of the different plies. This solidity is due to the friction of theplies and carbons upon one another,

which precludes slipping of the sheets upon one another, so that the pack moves around the platen as if all made in one piece.

While this relative creeping would not be objectionable for a short sheet, still it is found that in typing a long web, the creeping accumulates to such an extent that the corresponding forms printed upon the several webs becomes seriously out of register with one another.

One of the principal objects of the present invention is to overcome this creeping, and to this end I contrive to avoid the frictional contact of the plies .upon one another as they feedaround the platen; and I provide at the printing line means to co-operate with the platen to carry the work positively past the printing point in such a manner that all of the plies feed at-the same-v speed. The pack isnot bent upon theplaten in a'manner to cause the sheets to grip one another and feed as a solid body.

I In the preferred manner of practicing the invention, the sheets are led into the typewriting machine over a horizontal cross-bar, from which they descend and turn forwardly under another bar at about the level of the bottom of the platen; thence they run forwardly under the platen and beyond the same to a series of separate horizontal guide- Specification of Letters Patent. Patented Jung 13 jggg Application filed September 11, 1918. Serial No. 258,492.

the inner sheets. Hence the sheets pass the printing line at a uniform speed, andthe usual friction is not set up among the sheets or plies, nor do they bind together around the platen, and there is no tendency for the outer sheets to travel faster than the inner; and hence there is little, if any, accumulative creeping as the plies of web feed through the machine.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a sectional side elevation of an Underwood front-strike typewriting machine, modified to illustrate the present improvements in one form; the plies and arbons being shown as led into the mac ine from any suitable source of, supply, and as being conducted around the platen and up to the printing point in the manner already explained.

Figure 2 is an enlarged diagram, showing the relationship of the sheets and platen substantially as at Figure 1.

Figure 3 is a view similar to Figure 2, but showing a different form of front guide-bars over which the sheets turn to run up to the printing point. f

Figure 4 is a perspective front view of the typewriter carriage seen at Figure 1.

Figure 5 is an enlarged detail side view of a portion of Figure l, and shows the relation of the platen and the feed-rolls at the front thereof with respect to the gearing therebetween.

The webs 10 and interleaved carbons 11" may be ledinto the machine from any suit able source of supply, as for example in the manner shown in the Wernery and which they run forwardly to another crossbar 16 also provided upon said carriage, and

thence downwardly behind the platen 17 and under a lower horizontal cross-bar 18, under which the webs run forwardly at about the level of the bottomof the platen 4 17, which is mounted by means of an axle 19 in the end plates of the carriage 15.

A spring-pressed roll or set'of rolls 20 may be arranged to press the forwardly traveling sheets against the bottom of the revolving platen; although in practicing printing point or line Each of these individual bars 21 may serve both for its work-web 10 and its associated carbon 11; the work-web remaining in contact with the individual bar, and i the carbon-web facing. the work-web.

At the front of the lplaten 17 ,the-work is gripped bye pair offeed-rolls 22, which may be arranged one ateach end of the platen, outside of the printing field. Each roll may have a pinion 23, and these pinions may meshwith gears 24 fixed upon the platen axle, at a little distance from the platen wherebythese front rolls are positively driven at about the same surface speed as the platen, and serve as the principal controllers of the work; although the bottom rolls 20 may help to pull the webs off from the spools and advance them to the carriage, at the operation of the linespacing lever 24*. The bottom rolls, while aiding in this way, need not positively control the work, since in this form of the invention' they are preferably'not geared to-the platen.

By means of a release key 25-, provided upon the carriage, both, the front rolls 22 and the bottom rolls 20 may be cast off to release the sheets; said release key having an arm 26 connected by a pin 27 andslot 28 to an arm 29 whose forward end is fixed upon a rock-shaft 30, which-is journaled inthe ends of, the platen frame and car-,

. ries a pair of forwardly anddownwardly extending arms 31, which carry studs 32 extending towards each other and upon which the front rolls 22 are journaled. Another arm-33 upon the release key is connected by a link 34 toshort arm 35 which ex- 60 tends forwardly from a rock-shaft 36 beneath the-platen,- which has rearwardly ex-,

tending arms 37 to carry the bottom rolls 20; a suitable spring 38-being provided for the bottom rolls 20, and also springs 39, 40, for the front rolls 22. i

Variations may be resorted to within-the scope of the invention, and portions of the imlplrovements may be used without others.- aving thus described my lnvention, I claim:

1. The combination with a revoluble platen, of means for turning the platen,

and adapted toguide the .Webs beneath it clear of the platen, and at a point between the bottom of the platen and the printing line.

3. The combination with a revoluble platen, of means for conducting a plurality of separate superposed work-webs for wardly under the platen, and a sheet-guiding device mounted forwardly of the platen and adapted to guide the webs beneath it clear of the platen, and at a point between the bottom of the platen and the printing line, means for turning the platen, and

means co-operating with the turning platen at the printing line, adapted to grip the webs and feed them all at the same speed.

4. The combination with platen, of means for conducting a plurality a revoluble of tseparate supe posed work-webs forwardly under the laten, and upwardly in front of it, said means including a feedroll bearing against the platen, and also including means for directing the webs substantially rectilinearly' past the platen at said feed-roll. i

5. The combination with a revoluble platen, of a guide bar in rear thereof under which the sheets feed forwardly to and-beneath the platen, and a guiding device mounted forwardly of the platen below the printing line and under which the sheets .bend to run up to the printing line.

6. The combination with a revoluble platen, of a guide bar in rear thereof under which the sheets feed forwardly to and beneath the platen, a guiding device mounted forwardly of the platen below the printing line and under which the sheets bend to run up to the printing line. and-means in the vicinity of the printing line for feedingsuperposed sheets at the same linear speed.

.7..The combination with a revoluble platen, of means for conducting sheets for.- wardly under the platen. a sheet-guiding device under which the sheet runs between the bottom of the platen and printing line, said sheet-guiding device mounted forwardly of the platen, means in the vicinity of the printing lineof the platen for feeding superposed sheets at the same linear speed, and a paper-feeding roll to press the sheets in contact with the bottom of the platen.

8. The combination with a revoluble platen, of a guide bar in rear thereof under which the sheets feed forwardly to and beneath the platen, a guiding device mounted forwardly of the platen below the printing line and under which the sheets bend to run up to the printing line, means in the vicinity of the printing line for feeding superposed sheets at the same linear speed, and a paperfeeding roll to press the sheetsin contact with the bottom of the platen.

9. The combination with a revoluble platen, of means for conducting sheets forwardly under the platen, a sheet-guiding device under which the sheet runs between the bottom of the platen and printing line, said sheet-guiding device mounted for wardly of the platen, and means in the vicinity of the printing line of the platen for feeding superposed sheets at the same linear speed, said sheet-guiding device comprising a plurality of separate guiding bars over which work-sheets may run out--of contact with one another.

10. The combination with a revoluble platen, of means for conducting sheets forwardly under the platen, a sheet-guiding device under which the sheet runs between the bottom of the platen and printing line, said sheet-guiding device mounted forwardly of the platen, and means in the vicinity of the printing line of the platen for feeding superposed sheets at the same linear speed, said sheet-guidingdevice comprising a plurality of separate guiding bars over which worksheets may run out of contact with one another, said bars'in the form of segments or shells nested together.

11. The combination with a revoluble platen, of means for conducting sheets forwardly under the platen,- -a sheet-guiding device under which the sheet runs between the ,botto'm' of the platen and printing line," said sheet-guidlng device mounted-forwardly of the laten and adapted to guide sheets substantially rectilinearly to the printing line, and rolls m'ount ed on the printing lineat the ends of the platen to press the sheets against the platen.

12. The combination with a revoluble' platen, of a guide bar in rear thereof under which the sheets feed forwardly to and beneath the platen, a guiding device mounted forwardly of the platen below the printing line and under which the sheets bend to run up to the printing line, and rolls mounted on the printing line at the ends of the platen to press the sheets against the platen.

13. The combination 'with a revoluble platen, of means for conducting sheets forbottom of the platen and printing line, said sheet-guiding device mounted forwardly of the platen, rolls mounted on the printing line at the ends of the platen to, press the sheets against the platen, and means to reease said rolls simultaneously.

15'. The combination with a revoluble platen,-of means for conducting sheets forwardly under the platen, a sheet-guiding device under which the sheet runs between the bottom of the platen and printing line, said sheet-guiding device mounted forward] of the platen, means in the vicinity of the printing line of the platen for feeding superposed sheets at the same linear speed, paperfeeding rolls to press the sheets in contact with the bottom of the platen, rolls mounted on the printing line at the ends of the platen to press the sheets against the platen,

and means to release said front rolls and said bottom rolls simultaneously.

16. The combination with a revoluble platen and a platen frame, of a guide bar in rear of the platen over which the sheets bend to run downwardly, a guide bar in the rear of the lower portion of the platen under which the sheets bend to run forwardly, front individual guide bars forward of the lower portion of the platen, and feed rolls running upon the platen at about the printing line. 7

17. The combination with a revoluble platen and a platen frame, of a guide bar in rear of the platen over which the sheets bend to run downwardly, a guide bar'in the rear lower portion of the platen, feed rolls runnlng upon the platen at about printing line,,,,,129

and rolls to press the sheets against the bot-* tom of the platen.

18. The combination with a revoluble platen and a platen frame, of a guide bar in rear of the platen over which the sheets bend to run downwardly, a guide barin the rear of the lower portion of the platen under which the sheets bend to run forwardly, front individual guide bars forward of the lower portion of the platen, feed rolls runlower portion of the platen, feed rolls running upon the platen at about the printing line, rolls to press the sheets against the bottom of the platen, and means to release all of said rolls simultaneously.

20. Thecombination of a revoluble platen having gears at itsends, teed rolls to run upon the platen at the ends thereof, substantially at the printing line, devices clearof the printing line for supporting said rolls, yieldin means being provided for holding said r0 ls against the platen, and pinions connected to said feed rolls and meshing with said gears.

, 2-1. The combination of a revoluble platen having gears at its ends, feed rolls to run upon the platen at the ends thereof, substantially at the printing line, pinions connected to said feed rolls and meshing with said gears, a stud adjacent each end of the platen upon which its pinion and roll are mounted, arms carrying said studs, a rockshatt clear of the printing line and carrying said arms, yielding means effective on said arms for holding the rolls against the platen,

and a release key connected to said rockshaft. Y

22. The combination of a revoluble platen having'gears at its ends, feed rolls to run upon the platen at the ends thereof, substantially at the printing line, yielding-means being provided for holding said rolls against the platen, pinions connected to said feed rolls and meshing with said gears, studs upon which said pinions and rolls are mounted, arms carrying said studs, a rock-shaft carrying said arms, a release key connected to said rock-shaft, independently-revoluble rolls to press the sheets against the bottom of the platen,.and connections between said bottom rolls and said release key.

23. The combination With a revoluble platen, of means independent of the platen for directing a plurality of separate superposed work-webs substantially rectilinearly to the printing, line on the platen, and means connected with the platen to move at the same linear speed and co-operative therewith at the printing line to feed said work-webs all substantially at the same speed.

JUSHUA E. DAVIDSUN. Witnesses:

CATHERINE A. Nnwnnri, MARION lit. MCGAFFREY. 

